Hey mate, I live in Brisbane and am still quite 'youthilicous' so i havent exactly sampled the other major cities in my brief drug career. But its pretty evident if you visit sites like pill reports , good MDMA is very hard to come across and I would imagine even harder for an outsider without proper connections. Out of about 15 or so attempts on getting it this year, I have only had 3 good batches that were actual mdma, the rest are either speed bombs or plain shit. I have sampled coke twice here and the first time was pitiful, the second it actually looked legit but nothing that blew me out of the water, i actually cant write home much about it. Listening to others its another hard thing to find(good quality anyway).
The main stimulant you can rely on is Meth, if that floats your boat maybe you will score. As for rave scenes, not entirely sure. I have some friends in the scene here and they enjoy it. The east coast cities will have a decent club scene, Sydney and Melbourne probably the biggest so yeah. Hope this shambles of a fried response is somewhat helpful.